Answer: D
By the way, option C is equal to option B because there's no new information in C
Step-by-step explanation:
This is business. Looking at the agitation of the Dentists and the Dental board, you can see that if the dentists didn't speak up they would have less number of patients or clients once the other business start offering teeth whitening services to people.
Dentists are medical practitioners, yes, but they earn from treating people with teeth problems or issues.
Statement D hence portrays the mindset of the dentists and the dental board